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A Study on Modification of Nanoporous Rice Husk Silica for Hydrophobic Nano Filter

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Nanoporous rice husk silica (RHS) was modified with alkylsilylation reagents, hexamethyldisilazane, diethoxydiphenylsilane, dichlorodimethylsilane and n-octodecyltrimethoxysilane. The silica samples were characterized with Raman spectrometer, thermal gravimetric analyzer, scanning electron microscope, nitrogen adsorption measurement and solid state nuclear magnetic resonance spectrometer. Raman spectra of the modified silica showed growth of the peaks of C–H stretching and CH3 bending at ∼3000 cm−1 and ∼1500 cm−1, respectively. Weight losses of 3∼5% were observed in thermo gravimetric profiles of the modified silica. The microscopic shape of RHS, ∼20 nm primary particles and their aggregates was almost not changed by the modification but there were colligations of the silica particles in the sample treated with dichlorodimethylsilane or diethoxydiphenylsilane. BET adsorption experiment showed the modification significantly decreased the mean pore size of the silica from ∼5 nm to ∼4 nm as well as the pore volume from 0.5 cm3/g to 0.4 cm3/g except the case of treatment with n-octodecyltrimethoxysilane. 29Si Solid NMR Spectra of the silica samples showed that there were decrease in the relative intensities of Q2 and Q3 peaks and large increments in Q4 after the modification except for the case of bulky n-octodecyltrimethoxysilane. From the results, it was concluded that the alkylsilylation reagents reacted with hydroxyl groups on the silica particles as well as in the nano pores while the size of the reagent molecule affected its diffusion and reaction with the hydroxyl groups in the pores.
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Document Type: Research Article

Publication date: 2010-05-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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